The old saying is, "It's not what you know, it's who you know." If that gets split into two separate statements rather than one cliche, what's left?
What do you know? How do you know it? Can you rely on what knows it?
Is it who you know? Who is it that's knowing? Is the "who" you? Is it the "you" of your True Nature, or just a story you tell yourself about yourself, that maybe you believe, maybe not.
Who knows?